Method of making seamless metallic linings.



J. M. BURR & H. S. GIBBS;

METHOD OF MAKING SEAMLESS METALLIC LININGS.

APPLICATION FILED OUT. 10, 1907.

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J. M. BURR & H. S. GIBBS.

METHOD OF MAKING SEAMLESS METALLIC; LININGS.

APPLICATION FILED OCT. 10, 1907.

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JOHN M. BURR AND HORACE S. GIBBS, OF NORWALK, CONNECTICUT.

METHOD OF MAKING SEAMLESS METALLIC LININGS.

Specification of LettersPatent.

Patented May 25, 1909.

Application filed October 10, 1907. Serial No. 396,785.

To all whom it may concern:

Be it known that we, JOHN M. BURR and HORACE S. GIBBS, citizens of the United States, residing at Nor-walk, county of Fair field, State of Connecticut, have invented a new and useful Method of Making Seamless Metallic Linings, of which the following is a specification.

This invention has for its object to provide a method of making seamless metallic linings and similar articles for general use.

As it will be suflicient for the purposes of this specification to describe a single application of our novel method, its use in the manufacture of seamless linings for water closet tanks, rectangular in form and having vertical sides, Will be described in detail. These tank linings are preferably made from copper on account of the durability and nonoxidizing quality of that metal. So far as we are aware, copper tank linings have not heretofore been made integral but have been made from sections soldered together. Tanks made in this manner, however, separate at the joints on account of the expansion and contraction of the metal and not infrequently leak seriously, often doing great damage.

Our present invention enables us to provide a non-leaking and practically indestructible integral copper tank lining and at a less cost than the sectional copper linings now in use. This we accomplish by folding the metal of a blank to the required shape but without any drawing whatever or strain- The amount of metal required to make our novel integral linings is slightly greater at the corners than is required to make sectional linings, the principal saving in cost in the manufacture of our novel integral linings being in labor. In addition to greatly decreased cost for labor, the cost of solder is also eliminated in making our novel integral linings.

Our present invention furthermore enables us to make integral linings that are selfattaching to the tanks.

In the accompanying drawings forming a part of this specification, Figure 1 is a View of the blank from which our novel integral lining is formed Fig. 2 a plan view of the partly formed lining, illustrating the first operationin the method of making; Fig. 3 a plan view illustrating the second operation in the method of making, Fig. 4. a plan view illustrating the third operation in the method of making, which produces the completed lining; and Fig. 5 is a longitudinal section of a tank with the lining in place therein and also illustrating our novel mode of securing the lining in the tank.

denotes the blank which is rectangular in form, is clipped at the corners as at 11 to save metal and may or may not be provided at the portions corresponding with the sides and ends of the completed lining with wings or extensions indicated by 12, the purpose of which will presently be explained.

The first operation in forming the lining consists in bending the blank to substantially the form shown in Fig. 2. For convenience in description we have indicated the portion of the blank which forms the bottom of the tank by 13, the portions which form the sides by 14, the portions which form the ends by 15 and the portions which form the corners by 16, the lines at which the metal of the blank is bent being indicated by dotted lines as at 17. The first operation bends the sides and ends of the blank upward toward the vertical position, leaving the central portion of the blank which forms the bottom of the lining flat and leaving the corners bent to substantially the form of a sector of a circle in plan or cross section, the sectors of course tapering downward and inward from top to bottom and forming what might be termed pockets, which are indicated by 18.

The second operation brings the sides and ends of the lining to the vertical position and flattens the opposite walls of the pockets into contact with each other, as clearly shown in Fig. 3, the metal of the corners now lying in the form of folds consisting of two plies of metal in contact with each other and standing obliquely to the sides and ends. These folds are indicated by 19. They are V- shaped, as seen in elevation, and taper from the top downward, the sides running out at the bottoms of the corners.

The third and final operation bends the metal of the folds about the corners, as clearly shown in Fig. 4, forcing the inner faces of the folds into close contact with the sides and ends respectively, the edges of the folds extending downward and outward from the top of the lining to the lower ends of the vertical edges.

21 denotes a tank. The ordinary mode of attaching linings to tanks has been to fold the tops of the sides and ends of the lining over the top of the tank and then nail the lining in place. e preferably provide the sides and ends of the tanks near the top with grooves 20 and secure the linings in place by turning the wings 12 into these grooves, as clearly shown in Fig. 5. As the water line in tanks of this character is always at a distance below the top of the tank, it is unnecessary for the lining to extend to the top. By means of the fastening above described, we effect an important saving in the amount of metal required for each lining and make the attachment of the lining a much simpler and quicker operation to perform than heretofore, thus effecting an additional saving in labor in attaching the lining to the tank. The greatest saving, however, effected by our novel method of making linings is in the labor required in forming them to shape from the blanks. In practice, the operations of forming the linings may be performed by hand or mechanically by presses and without any hand labor whatever, the metal being bent and folded to shape without any drawing or strain being placed upon any portion of the blank. We thus secure the best possible results and provide integral vertical-sided linings, without solder and without hand labor and in addition thereto we make the linings self-attaching in place.

Having thus described our invention we claim:

1. The method of making seamless metallic linings, which consists in forming blanks to the required shape, bending the portions of each blank which form the sides and ends of a lining upward leaving the central portion of the blank flat and forming pockets at the corners, then bending the sides and ends to the vertical position and flattening the opposite walls of the pockets into contact with each other without turning any portions of the walls of the pockets out of a substantially uniform flat plane thus leaving flat folds of metal standing obliquely to the sides and ends, and finally bending the inner faces of the folds into contact with the sides and ends respectively.

2. The method of making seamless selfattaching metallic linings, which consists in forming blanks with clipped corners and wings at the sides and ends, for the purpose set forth, then bending the portions of blanks which form the sides and ends of linings vertical to the bottom portions, bending the corner portions to form downwardly tapering pockets, then flattening the opposite walls of the pockets into contact with each other without turning any portions of the walls of the pockets out of a substantially uniform flat plane thus leaving flat folds of metal standing obliquely to the sides and ends, and finally bending the inner faces of the folds thus formed into contact with the sides and ends respectively, leaving the wings standing vertically.

In testimony whereof we affix our signatures in presence of two witnesses.

JOHN M. BURR. HORACE S. GIBBS.

l/Vitnesses:

WILLIS H. SELLEcK, CHESTER S SELLEoK. 

